notmyself said:
Boils down to line attenuation and noise
90% of my Net speed problems over the years have been line-related, the local linesman causing most of these when cutting (or stepping on) lines for "testing" and just twisting the new line ends poorly together (often without any insulation tape). Your local linesman will never find an intermitting noise problem, and may actually cause a new one to appear with his "testing".
Try this neat free app to measure and graph line noise (Signal/Noise Ratio, SNR): RouterStats
Look for noise spikes on the line, specially on windy/rainy days.
Also look for specific times of the day (e.g. evening) when SNR drops - this indicates electric power interference, and could be your line has been used as a support anchor for someone's power line.




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